An automatic acoustic warning system that makes electric buses audible at low speeds and in reverse, restoring the sound cue pedestrians rely on. Engineered to the requirements of India's AIS-173.


Automatic Activation
Switches on by default at every start-up, with no action needed from the driver.
Low-Speed & Reverse Coverage
Sounds from start-up up to about 20 km/h, and whenever reverse is engaged.
Front & Rear Speaker Zones
Multi-zone coverage gives a clear, localisable warning.
Bus-Ready Design Options
Weatherproof, vibration-rated underbody enclosures, a driver pause switch, fault alerts and a brand-tuned soundscape within legal limits.
Automatic Activation
Switches on by default at every start-up, with no action needed from the driver.
Low-Speed & Reverse Coverage
Sounds from start-up up to about 20 km/h, and whenever reverse is engaged.
Front & Rear Speaker Zones
Multi-zone coverage gives a clear, localisable warning.
Bus-Ready Design Options
Weatherproof, vibration-rated underbody enclosures, a driver pause switch, fault alerts and a brand-tuned soundscape within legal limits.

Bus

Train / Railways

Metro

Airport Shuttle

School Buses

Employee Transport

City Transit Buses

Electric Buses

BRT Systems

Healthcare

Warehouse

Bus

Train / Railways

Metro

Airport Shuttle

School Buses

Employee Transport

City Transit Buses

Electric Buses

BRT Systems

Healthcare

Warehouse
An Acoustic Vehicle Alerting System automatically generates an external warning sound whenever an electric vehicle is moving quietly at low speed or in reverse.
Below about 20 km/h, electric buses are almost silent. That is exactly where buses operate most: depots, terminals, bus stops, school zones and stop-and-go traffic.
Yes. AIS-173 requires AVAS on new electrified M and N category vehicles, including buses, from 1 October 2026, and on existing models from 1 October 2027.
From start-up up to about 20 km/h going forward, and at any speed in reverse. Above 20 km/h it switches off, as road and wind noise are enough.
Yes, A brand-distinct tone can be tuned for an OEM or fleet, provided it stays within the legal sound envelope.
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Our Product Specialist can help you identify the right transportation technology for your operational needs.
Contact SalesAn Acoustic Vehicle Alerting System automatically generates an external warning sound whenever an electric vehicle is moving quietly at low speed or in reverse.
Below about 20 km/h, electric buses are almost silent. That is exactly where buses operate most: depots, terminals, bus stops, school zones and stop-and-go traffic.
Yes. AIS-173 requires AVAS on new electrified M and N category vehicles, including buses, from 1 October 2026, and on existing models from 1 October 2027.
From start-up up to about 20 km/h going forward, and at any speed in reverse. Above 20 km/h it switches off, as road and wind noise are enough.
Yes, A brand-distinct tone can be tuned for an OEM or fleet, provided it stays within the legal sound envelope.
Need Help Selecting the Right Product?
Our Product Specialist can help you identify the right transportation technology for your operational needs.
Contact Sales